Muffler.



v WITNESS? !NVEIL\JTOR; I

E. SCHMITT.

MUFFLER.

APPLICATION FILED JULY 31.1912. RENEWED MAY I5, 1914.

UNITED STATES PATENT onnion.

.EDMUNID SCHMITT, OF BRIDGEPCR'I, CONNECTICUT.

uunnnnn Specification of,I.etters Patent.

Patented Oct. 19, 1915.

Application filed July 81, 1912, Serial No. 712,457. Renewed May 15,1914. Serial No. 838,891.

To all wkom it may concern:

Be it known that I, EDMUND SoHMrrr, a citizen of the United States,residing at Bridgeport, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements inCombined Mufliers and Heaters; and I do hereby declare the following tobe a'full, clear, and exact description of the invention, such as willenable others skilledin the art to which it appertains to'make and usethe same, reference being had to the accompanying drawings, and tofigures of reference marked thereon, which" form a part of thisspecification.

This invention .relates to an improved muflier which is designed toreceive the discharge gases from ,internal combustion engines and thelike, and discharge them noisecharge lessly, the muffler comprising ac'asing'having an inlet and an outlet, the casing having plates arrangedbetween the inlet and outlet to form passages that are circuitous, the

passage formed by the plates not being one 8 continuous passage, but isbroken by reason of the plates not being arranged end to end.

The invention also provides a muffler of this type having an inner andouter tube, the tubes being closed at their'ends except for the inletand outlet passages fo r gas and having circuitous passages formedbetween the tubesso as to provide clearly defined passages for thecircuitous travel of thegases.

The mufller also provides a sleeve adapted to be placed in the open endof the inner tube adjacent to the inlet, the sleeve being perforated,and a sleeve that 1s placed 1n the tube is provided with proper sizedholes according to the engine on which the muifler is being used, sothat by changing the sleeve for one with different sized holes, orremoving the sleeve altogether, the same mufi'ier can be adapted fordifferent quantities of gas. j

The invention is further designed to provide a muflier of this typehaving a pipe projecting charge, pass through end of the muflier,

this pipe allowing enough. gas to to act as an ejector at the disand inthis way the passage of the gas through the circuito us 3 -.*-passage ofthe muffler isfacilitated.

- 1 The invention is further designed to prO- vide a muflier having abaflle-plate which is preferably cone-shaped, the baflie-plate bethroughthe-casing toward its disgases passing into the muflier and directingthem through a series of perforations at the entrance end of the innertube whereby the gases are led to the circuitous passages, the innertube at its outlet end being perforated so that the gases are'welldistributed and have suflicient channel or passage so as to not give anyundue back pressure, as will be evident.

The invention is illustrated in the accompanying drawings, in which-Figure 1 is a sectional view of the muflier, a part of the inner tubeand the helical plates being shown in elevation. Fig. 2 is an end viewof Fig. 1. Fig. 3 is a section on' line 3, 3, in Fig. l.

The muflier, which is the subj ect-m-atter of this application, may beconstructed in a number of waysto provide for the travel of the gasesthrough the mufiler in a circuitous manner, and different structures canbe made to bring such a result about, but I show in the drawings oneembodiment of my invention in which the whirling or circuitouscircumferential movement :of the gases is caused by a set of plateswhich are arranged to progress the gases toward the outletend of themuflier, but in a manner to break up the volume of gas as it passes thusthrough the muffler, this beingpreferably brought about by arranginghelical or similarly curved plates so that they do not abut and formcontinuous channels which, however, are irregular, and the gases aredivided in their passage, and thus this division and sub-division, inpassing through the mufiler, is calculated to eliminate the noise of thedischarge.

The-muflier shown in the drawings as embodying one type of the devicecomprises an inner tube 10 and an outer tube 11, these tubes being. heldin place by end-plates 12 and 13, the end-plate 12 having a dischargenozzle 14 secured to it, the end-plate 13 having a spider 15 on itsfront face, the spider L5 and the end-plate 12 being connected bysuitable tie-rods 16, the tie-rods drawing tively, which overlap theoutside edge of the outer tube. Bolts 19 pass through the flanges 20 ofthe inlet nozzle 21 and on the inner side embrace the flange 22 of athimble 23 which is open for the most part, being cut away except forthe strips 24: as shown clearly in Fig. 3. In the end of the thimble isscrewed a baflie-plate 25, preferably made in the shape of a cone whichreceives the exhaust gases coming in through the inlet nozzle 21 anddirects them out through the sides of the thimble.

If it is found that more retarding of the gas is desired, a removablesleeve 26"having perforations 27 is slid within the thimble between thecone and the endplate,' this thimble being adapted to be replaced byanother of different sized openings when desired, according to theamount of gas and the force with which it is expelled into the mufiler.The outlet end of the inner tube is provided with perforations 28.Between the inner and outer tubes are arranged the helical plates 29,these plates being arranged to form a helical or circuitous passagearound the inner tube, the plates being arranged as shown in Fig. 1,that is, they are placed so that their ends do not abut, whereby adividedor broken passage is provided which I have found causes a betterdispersion of the gas and abetter silencing of the discharge. The innertube 10 rests on the back edge of .the screw-threaded collar of the cone25, this collar being screwed into the end 30 of the thimble, as will beseen from Fig. 1. A pipe 31 is fitted in the cone and extends backthrough the inner tube toward the discharge opening. The pipe with itsoutlet nearv the discharge end of the inner tube receives enough of thegas directto form a suction at the outlet end of the discharge, whichfacilitates the passageof the exhaust gases through the'mufiier, ,butdoes not interfere with the silencing function of the motor in theleast.

It will be understood that 'in this specifi-' cation and in the drawingthe plates have of helicalplates between the inner and outer tubes, the"plates being disposed around the inner tube so that their ends form anopening between them whereby they form a continuous irregular channel; A

2. A muflier consisting of an inner tube, an outer tube, the inner tubehaving open ings near its ends, end-plates having inlet and outletopenings to the inner tube, helical plates surrounding the inner tubeandarranged so that their ends are spaced apart, and a deflecting plateat the inlet end of the inner tube.

. 8. A muffler consisting-of an inner tube, an outer tube, the innertube having o enings near its ends, end-plates having inlet and outletopenings to the inner tube, helical plates surrounding the inner tubeand arranged so that their ends are spaced apart, a deflecting platenear the inlet end of the inner tube, and anopen-ended pipe passingfrom-the plate 'into the inner tube.

'4. A mufller consisting of an inner tube, an outer tube, the inner tubehaving openings near its ends, end-plates having inlet and outletopenings to the inner tube, helioal plates surrounding the inner tubeand arranged so that their ends are spaced apart, a cone placed withinthe inner tubebeyond the openings at its inlet end, and a pipe extendingalong the inside of the inner tube to approximately the outlet endthereof.

5. A muflier consisting of an inner'tube, an outer tube, end-plates,each end-plate having an opening communicating with the inner tube, theinlet end of the inner tube being cut away to form large openings, abaflle-plate'in the inner tube adjacent to its cut away end, platesarranged between the inner and the outer tubes to form a circuitouspassage, the outlet end of the inner tube being perforated, and aremovable sleeve having perforations therein adapted to fit within theinner tube between the baflleplate and the inlet end of the inner tube.

6. A mufiier consisting of an inner tube, an outer tube, end-plates,each end-plate having an opening communicating with the inner tube, theinlet end of the inner tube being cut away to form large openings, 9.

baflle-plate in the inner tube adjacent to its cut away end, platesarranged between the inner and the outer tubes to form a circuitouspassage, the outlet end of the inner tube being perforated, a removablesleeve hav ing perforations therein adapted to ,fit with- 1n the innertube between the bafile-plate and .the inlet end of the inner tube, anda pipe extending from the battle-plate through the inner tube toward theoutlet end thereof.

7. A mufller consisting of an inner tube,

an outer tube, end-plates having openings in communication with thespace between the outer and the inner tubes, and a series of helicalplates arranged around the inner tub e, the plates being arranged sothat their ends form spaces between them whereby they form a broken,circuitous passage.

8. A mufl'ler consisting of a chamber constructed with an inlet and anoutlet and w1th an internal structure to cause a circuitous passage ofgases through it, and a pipe of small diameter to conduct a smallproportlon of the gases direct from the inlet to the outlet. I

9. A- muffler comprising an inner tube, an outer tube, the inner tubesbeing perforated at its inlet end, and having plates on its outside toconduct gases by a circuitous route, a cone at the inlet end of theinner tube, and a pipe of comparatively small diameter extending fromthe cone to the outlet of the mufller.

10. A muffler comprising a casing, the casing having inlet and outletopenings in its opposite ends, the casing having plates between itsends, the plates being disposed to provide an approximately helical andcontinuous irregular channel for the passage of gases through themufiler.

11. A muffler comprising a casing having its ends provided withopenings, and plates forming a channel extending from one open- 12. Amufller comprising a casing consisting of an outer tube, an inner tube,the ends of the casing having openings therein, the space between theinner tube and outer tube being in communication with said openings, andsubstantially helical plates between said tubes and so arranged as toform a non-continuous irregular channel.

13. A muflier comprising a casing consisting of an outer tube, an innertube, the ends of the casing having openings therein, the space betweenthe inner tube and outer tube being in communication With said openings,and substantially helical plates between said tubes and arranged so thattheir ends are spaced apart to form a continuous irregular channel. I

In testimony, that I claim the foregoing, I have hereunto set my handthislOth day of June 1912.

EDMUND SCHMITT. Witnesses:

JOHN W1LsoN, E. D. HAYES.

